Enhanced response of the photoactive gas sensor on formaldehyde using porous SnO2@TiO2 heterostructure driven by gas-flow thermal evaporation and atomic layer deposition

Chang, Hyeon-Kyung; Ko, Dong-Su; Cho, Deok-Hyun; Kim, Sungjin; Lee, Ho-Nyun; Lee, Hyo Sug; Kim, Hyun-Jong; Park, Tae Joo; Park, Young Min

doi:10.1016/j.ceramint.2020.10.172

Cited by 29 publications

(9 citation statements)

References 48 publications

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“…Other recent sustainable approaches for the preparation of sensors for formaldehyde detection include the use of largely available and inexpensive materials such as tin and zinc [ 121 , 122 , 123 , 124 , 125 , 126 , 127 , 128 ], the second most abundant element in the Earth’s crusts, i.e., silicon [ 129 , 130 ], the use of biomass-derived materials, such as bacterial cellulose [ 131 ] or egg-white [ 132 ].…”

Section: Section A: Environmental Analysismentioning

confidence: 99%

Paving the Way for a Green Transition in the Design of Sensors and Biosensors for the Detection of Volatile Organic Compounds (VOCs)

et al. 2022

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The efficient and selective detection of volatile organic compounds (VOCs) provides key information for various purposes ranging from the toxicological analysis of indoor/outdoor environments to the diagnosis of diseases or to the investigation of biological processes. In the last decade, different sensors and biosensors providing reliable, rapid, and economic responses in the detection of VOCs have been successfully conceived and applied in numerous practical cases; however, the global necessity of a sustainable development, has driven the design of devices for the detection of VOCs to greener methods. In this review, the most recent and innovative VOC sensors and biosensors with sustainable features are presented. The sensors are grouped into three of the main industrial sectors of daily life, including environmental analysis, highly important for toxicity issues, food packaging tools, especially aimed at avoiding the spoilage of meat and fish, and the diagnosis of diseases, crucial for the early detection of relevant pathological conditions such as cancer and diabetes. The research outcomes presented in the review underly the necessity of preparing sensors with higher efficiency, lower detection limits, improved selectivity, and enhanced sustainable characteristics to fully address the sustainable manufacturing of VOC sensors and biosensors.

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Section: Section A: Environmental Analysismentioning

confidence: 99%

Paving the Way for a Green Transition in the Design of Sensors and Biosensors for the Detection of Volatile Organic Compounds (VOCs)

et al. 2022

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“…The sensor based on mixed Fe 2 O 3 -In 2 O 3 nanotubes was also reported to show a high gas sensor response of ~33 towards 100 ppm of formaldehyde at 250 °C [ 82 ]. TiO 2 nanoparticle-functionalised In 2 O 3 nanowires [ 83 ], SnO 2 /In 2 O 3 composite hetero-nanofibres [ 84 ], an octahedral-like ZnO/CuO composite [ 85 ] and a nanoporous SnO 2 @TiO 2 heterostructure [ 86 ] were reported to show enhanced gas sensing properties towards acetone, formaldehyde and H 2 S, respectively.…”

Section: Nanostructured Metal Oxide Heterojunctions For High-performance Gas Sensorsmentioning

confidence: 99%

“…TiO 2 composited with ZnO, MoS 2 , MoO 3 , V 2 O 5 and WO 3 have been designed and successfully established, exhibiting improved gas sensing performances towards ethanol, NO 2 , alcohol and ammonia [33,55,[76][77][78]. For example, the ZnO-decorated TiO 2 nanotube layer (prepared by anodic oxidation combined with atomic layer deposition) [76], TiO 2 /V 2 O 5 branched nanoheterostructures (synthesised by an electrospinning process followed by an annealing treatment) [33] and a TiO 2 -WO 3 composite (obtained via plasma spraying technology using mixed feedstock suspensions) [77] [86] were reported to show enhanced gas sensing properties towards acetone, formaldehyde and H 2 S, respectively.…”

Section: Gas Sensors Based On N-p Junctionsmentioning

confidence: 99%

Metal Oxide Based Heterojunctions for Gas Sensors: A Review

et al. 2021

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The construction of heterojunctions has been widely applied to improve the gas sensing performance of composites composed of nanostructured metal oxides. This review summarises the recent progress on assembly methods and gas sensing behaviours of sensors based on nanostructured metal oxide heterojunctions. Various methods, including the hydrothermal method, electrospinning and chemical vapour deposition, have been successfully employed to establish metal oxide heterojunctions in the sensing materials. The sensors composed with the built nanostructured heterojunctions were found to show enhanced gas sensing performance with higher sensor responses and shorter response times to the targeted reducing or oxidising gases compare with those of the pure metal oxides. Moreover, the enhanced gas sensing mechanisms of the metal oxide-based heterojunctions to the reducing or oxidising gases are also discussed, with the main emphasis on the important role of the potential barrier on the accumulation layer.

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Section: Preparation Of Porous Sno2 Nanoformmentioning

confidence: 99%

“…The highly porous SnO nanoform was fabricated by Ar-assisted modified thermal evaporation, as previously reported [33,34]. The SnO source was kept in a Ta boat, which was subsequently placed at the center of the chamber, and the Si/SiO 2 substrate was placed at the upper site, with the cooling system at 23 • C. During thermal evaporation, the highly pure Ar gas (99.9999%) flowed with 100 sccm to reach a pressure of 0.2 Torr after evacuation to a 5 × 10 −6 Torr pressure, and the SnO source was rotated at a speed of 8 rpm in order to form a uniform nanoporous structure.…”

Section: Preparation Of Porous Sno 2 Nanoformmentioning

confidence: 99%

Highly Porous SnO2/TiO2 Heterojunction Thin-Film Photocatalyst Using Gas-Flow Thermal Evaporation and Atomic Layer Deposition

et al. 2021

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Highly porous heterojunction films of SnO2/TiO2 were prepared using gas-flow thermal evaporation followed by atomic layer deposition (ALD). Highly porous SnO2 was fabricated by introducing an inert gas, Ar, during thermal evaporation. To build heterogeneous structures, the TiO2 layers were conformally deposited on porous SnO2 with a range of 10 to 100 cycles by means of ALD. The photocatalytic properties for different TiO2 thicknesses on the porous SnO2were compared using the degradation of methylene blue (MB) under UV irradiation. The comparisons showed that the SnO2/TiO2-50 heterostructures had the highest photocatalytic efficiency. It removed 99% of the MB concentration, and the decomposition rate constant (K) was 0.013 min−1, which was approximately ten times that of the porous SnO2. On the other hand, SnO2/TiO2-100 exhibited a lower photocatalytic efficiency despite having a TiO2 layer thicker than SnO2/TiO2-50. After 100 cycles of TiO2 ALD deposition, the structure was transferred from the heterojunction to the core–sell structure covered with TiO2 on the porous SnO2, which was confirmed by TEM analysis. Since the electrons photogenerated by light irradiation were separated into SnO2 and produced reactive oxygen, O2−, the heterojunction structure, in which SnO2 was exposed to the surface, contributed to the high performance of the photocatalyst.

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Enhanced response of the photoactive gas sensor on formaldehyde using porous SnO2@TiO2 heterostructure driven by gas-flow thermal evaporation and atomic layer deposition

Cited by 29 publications

References 48 publications

Paving the Way for a Green Transition in the Design of Sensors and Biosensors for the Detection of Volatile Organic Compounds (VOCs)

Paving the Way for a Green Transition in the Design of Sensors and Biosensors for the Detection of Volatile Organic Compounds (VOCs)

Metal Oxide Based Heterojunctions for Gas Sensors: A Review

Highly Porous SnO2/TiO2 Heterojunction Thin-Film Photocatalyst Using Gas-Flow Thermal Evaporation and Atomic Layer Deposition

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